James graduated from the Royal (Dick) School of Veterinary Studies, Edinburgh in 2001. After four years in mixed practice he travelled between the hemispheres working for a number of years in specialist stud practice in the UK, Australia and New Zealand. In 2010 he was awarded the RCVS certificate in Equine Stud Medicine and in 2011 became a lecturer at Liverpool University examining the stud medicine certificate since 2012.

James has published work on many topics relevant to clinical practitioners including material on breeding soundness evaluation, infectious disease, peri-partum problems, ovarian abnormalities, oestrus suppression, persistent endometrial cups, management of spring transition and twin pregnancy. James continues to perform and publish practice based research and collaborates widely. In 2013, he became director of Equine Reproductive Services (UK) Limited growing and developing a busy first opinion and referral equine practice in Yorkshire. James is recognised as an Advanced Practitioner in Equine Stud Medicine, he is a current BEVA council member and trustee of the International Equine Reproduction Trust.

James has made a sustained and significant contribution to veterinary professional development with formal and informal teaching and assessment of post graduates. James has organised and delivered many CPD courses and congresses in the UK and Europe and has delivered presentations on material ranging from basic to advanced topics around the World. In 2022, his efforts were recognised by the Royal College of Veterinary Surgeons who awarded James with a Fellowship for meritorious contributions to clinical practice.

Angus graduated from Melbourne University in 1978, and worked in private practice for a year, before heading to Ontario Veterinary College, Guelph, Ontario, Canada in 1980 to work and study for a Diploma in Large Animal Medicine. He continued at Ontario Veterinary College as Assistant Professor in Large Animal Medicine, Surgery and Reproduction for the period 1982-84. Angus then travelled to Colorado State University, USA, where he was employed as Assistant Professor in Equine Reproduction and Field Service 1984-1988, and as Associate Professor in Equine Medicine and Field Service 1988.

Dr. Sielhorst is a Diplomate of the European College of Animal Reproduction and is currently affiliated with the Tierärztliche Hochschule Hannover and the equine hospital Tierärztliches Kompetenzzentrum Karthaus. She obtained her veterinary degree in 2006 and received her specialty training at the University of Hannover in Germany. Her research interests include ultrasonography of the late pregnant mare, use of Doppler ultrasonography in the pregnant mare and functionality of the pregnant uterus.

Dr. Karen Wolfsdorf attended veterinary school at the University of Florida and graduated in 1992.  After completion of her DVM, she began an equine field service internship at North Carolina State University.  In 1995, Dr. Wolfsdorf completed a residency in Theriogenology at the University of Florida and became board certified in Theriogenology.  Before coming to Hagyard Equine Medical Institute, she spent time working in Australia with Dr. Pascoe at Oakey Veterinary Hospital.  In 1996, Dr. Wolfsdorf joined Hagyard as an Associate and in 2002 she became one of the first two woman Members of the Practice.  Dr. Wolfsdorf’s main area of interest is infertility in the mare and problems during pregnancy.  She spends her time working as a field veterinarian and as a specialist at the McGee Fertility Center.

She has authored many chapters on equine reproduction as well as lectured worldwide and published research regarding progesterone, retained endometrial cups and equine twin reduction with cranio-cervical dislocation.

Dr. Wolfsdorf and her husband are involved as owners and breeders in the Thoroughbred industry and have two daughters who ride pony hunters.